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07 August 2025 | Story Martinette Brits | Photo Stephen Collett
Prof Willem Boshoff
Prof Willem Boshoff shares insights from decades of rust disease research during his inaugural lecture at the University of the Free State.

Rust diseases of food crops remain one of agriculture’s most enduring and evolving challenges. In his inaugural lecture on 23 July 2025 at the University of the Free State (UFS), Prof Willem Boshoff shared how these complex pathogens continue to pose a significant threat to South Africa’s staple crops – and why continued research is more critical than ever.

Titled Battling rust diseases of food crops in South Africa, the lecture reflected on decades of rust research and recent developments in pathogen virulence. Prof Boshoff, from the Department of Plant Sciences, emphasised that the threat posed by rust fungi today stems from their “mechanisms of variability, their ease of long-distance spore dispersal, and subsequent foreign race incursions”.

 

A shifting disease landscape

Rust fungi are biotrophic organisms that cannot be cultured on artificial growth media. This makes rust research a technically demanding field that requires living pathogen collections, seed sources, skilled researchers, and specialised infrastructure. Prof Boshoff noted that for more than 35 years, the UFS has been at the forefront of this work, monitoring rust pathogens on wheat, barley, oats, maize, and sunflower.

While wheat remains the most extensively studied type, recent rust outbreaks across a range of crops point to a worrying trend. A localised outbreak of stem rust on spring wheat in the Western Cape has been linked to race BFGSF, which carries a previously unknown combination of virulence genes affecting both wheat and triticale. In 2021, leaf rust race CNPSK was detected, showing virulence to the highly effective Lr9 resistance gene.

More recently, stripe rust race 142E30A+ – first reported in Zimbabwe – was found in wheat cultivars from the Free State and northern irrigation areas. “Results revealed increased susceptibility of especially spring irrigation wheat cultivars,” Prof Boshoff explained, particularly due to its virulence to the Yr9 and Yr27 resistance genes.

Rust pathogens affecting other crops are also evolving. In maize, only a few lines with mostly stacked resistance gene combinations were effective against all tested isolates. In sunflower, just four of 30 Agricultural Research Council national trial hybrids showed resistance to local rust races.

 

Building better resistance

A key strategy in rust control lies in identifying and understanding resistance in host plants. This, Prof Boshoff stressed, requires optimised phenotyping systems for both greenhouse and field conditions, along with a solid understanding of available resistance sources. At the UFS, several recent studies have contributed valuable data to both local and international plant breeding programmes.

“Continued local and regional rust research is critical,” he said. “It supports early detection of new races, alerts to producers through updated cultivar responses, and enables efficient breeding strategies and other sustainable methods of rust management.”

The rust programme at the UFS has not only supported varietal release and on-farm risk management, but also strengthened collaboration between plant scientists, industry partners, and international researchers. With South Africa’s strategic location and history of rust surveillance, the programme continues to play a pivotal role in continental and global food security efforts.

 

About Prof Willem Boshoff

Prof Willem Boshoff is a plant pathologist with a strong background in wheat breeding and rust disease control. He holds four degrees from the University of the Free State, all awarded cum laude: a BScAgric (1994), BScAgric Honours (1995), MScAgric (1997), and PhDAgric (2001). His doctoral research focused on the control of foliar rusts in wheat.

Between 2001 and 2016, he worked as a wheat breeder and contributed to the release of several commercial cultivars. He joined the UFS Department of Plant Sciences in 2017 and has since been actively involved in national and international research projects, capacity development, and advancing disease resistance in food crops.

News Archive

Two degrees in three years for former teacher
2013-12-17

Jacqui Middleton

When Jacqui Middleton entered university in 2011, she did so alongside her daughter, both women enrolling for their first-year studies at the University of the Free State. Three years later and the mother of three have completed two degrees – a double feat achieved with distinction.

Middleton, a former teacher, will receive a BA degree in Corporate and Marketing Communications at the April 2014 graduation ceremony and a master’s degree in Sustainable Agriculture at the June graduation ceremony. With these two qualifications in the bag, Middleton will pursue her studies with a BCom Honours degree next year, as well as a PhD degree in Sustainable Agriculture.

“It was my first full-time studies since 1988,” says Middleton. “I was a teacher for 22 years and my husband kept saying that I needed to get out of the classroom and into the corporate world. I was reluctant because I was so passionate about education and my children were still at school.”

Things changed when Prof Jonathan Jansen, Vice-Chancellor and Rector of the UFS, visited the Ikanyegeng Primary and High School in Jacobsdal – where she was a teacher – to deliver a motivational talk. Middleton approached Prof Jansen about a bursary. The next year, with the support of her family, she moved to Bloemfontein and stayed on campus studying for two degrees.

“For me it was a major step of faith because we were relying on my salary and I had to give that up to study, so we had to believe there is something bigger beyond the three-year period.”

Something bigger definitely awaited. Her study record of the last three years reflects a dedicated student who passed most of her subjects with marks higher than 80%. 

With her new qualification, Middleton will follow a career in agriculture and farming with her husband. ”I am still passionate about education, but now I am passionate about educating farmers to assist with the land reform process. Land reform is crucial for food security in our country and at the moment we need more success stories of black farmers moving from emerging to commercial farming. I believe that whatever you studied in life should not be wasted.”

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